An object is placed at a distance of 10 cm in front of a concave mirror. Its image is formed at a distance at 15 cm on the same side. The focal length of the mirror is?
A-6 cm
B6 cm
C-30 cm
D30 cm
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Related Questions:
What should be the position of an object in front of a concave mirror to get a real image having the same size as that of the object ?
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